Awesome and easy to understand. I'm a mechanical engineer that deals with lots of electronics but don't have a solid understanding of the magic pixies that make up electronics. You provide an education in a way I can understand. Thank you. Wish more professors would teach like this. Reading and understanding books is a awful and slow challenge for me because of dyslexia that was never seen in elementary school (they didn't look for things like that in the 1970's). Videos help many such as myself that learn visually.
Thank you for this video! I've heard so many people talking about VFDs at work. I thought it would be a much more difficult concept to learn before seeing this video. It was so easy to understand! The real world example (changing frequency to a ceiling fan) helped me understand exactly what was going on! Excellent video!
Great, good deal bro. VFDs have a plethora of settings a have some with over 120, but this is a very basic intro. Besides they have a lot of internal components that might get damaged if calibrated incorrectly.
this really shines a light on to why manufactures prefer to size a motor a bit larger. if my blower motor is rated @1 inwc they often times say for reliability reasons it should be less the .7 inwc even tho its rated at 1 inwc. building on this, heat is what kills a motor and my amp draw is significantly lower at .7 I have a lot less heat and in relative terms more airflow for the given amount of heat. super cool thanks for the video. I already knew how a VFD worked but i'm happy i watched it anyways because this is key information.
Motors are dumb!!! Hahaha 🤣 cool video!!! I’m an experienced electrician but I always watch this video, it makes me laugh and it’s always good to go back to the basics once in a while.
Agreed, I came to understand the DC-AC inversion and at 8:00 he makes it a lot more understandable.. Yet I don't get why the motor sees that conversion as a sinwave equivalent(and because it is dumb is not enough to account for it)
1 thing he didnt really explain is that was the on/off square wave VOLTAGE pulses to motor. Simply when you have a resistance (motor windings) and you apply voltage to a resistance, you get a current drawn by the load (motor). Because the voltage on/off pulses are so quick (microseconds, not even milliseconds), the motor cant tell that the voltage is going on and off so quick and continues to draw a near sinusoidal CURRENT and therefore rotate. As voltage stays on for more and more time, the current drawn reaches its peak, then voltage on/off time (mark/space) is reduced again, the current drawn starts to drop to zero, then the negative bus voltage is switched on to draw the negative current. The sinusoidal 'sinewave' shown over the square wave in video was the CURRENT drawn by the motor. Reducing the voltage on/off times reduces current frequency, which is directly related to motor speed, eg; 10Hz - 60Hz current draw.
+Ernesto Sastre, it seems like the it's no longer a sine wave anymore. It's like a digital signal or binary code ( varying intensity within the - or the +) so this trick kind of fools the motor into start spinning. perhaps if I attached mi oscilloscope I'd be able to see a squarish sine signal (well sort of) genius. Hit replay and see if I make sense.
+lastnameavailableok One 60 Hertz means that the current changed 60 times in one second + to -, back and forth. One Hertz is 1/60th of second. If the VFD was capable of handling kHz or MHz then, yes it would be thousandths or millionths of a second.
Schools don't have to compete for your attention by focusing on what is best for you. They're in the business of making legislators/funding sources happy.
Super tutorial! I am contemplating replacing a single phase motor on my drill press with a 3 phase motor and a VFD. I think I have a better understanding of torque vs. speed now. Thanks.
Thanks a lot for this video. Definitely appreciate you going all the way from how a motor that would benefit from a VFD works and how, internally, the VFD works, to the applications of the device itself. Much appreciated.
This explains why the control boxes for the huge ventilation fan motors at my Counties welding shop are soo big, I thought the control boxes for the fan were just for starting and shutting off the motors, then the instructor said the control boxes were for how much air is being sucked out and it senses what the air pressure in the room is, they're huge 3 phase motors maybe 20 or so HP, so how can you control the speed of huge 3p motors, with huge VFD boxes
Very good video, however, don't forget a VFD is the most expensive way to save energy dollars on motors for a facility or home, in the end, we are talking about reducing demand charges which is the reduction in the electric bill. Reducing electric charges can be done in a number of ways 1 - Schedule the time when large motors will run, generally moving those operations to later periods say, late after to evening, 2 - hard start kits, which are a large capacitor place at the motor being started reducing in-rush draw and reducing demand on the electrical system, 3 - VFDs, however, make sure all motors with VFD's are inverter-duty or change the standard motors to ECM type which will have a cost saving also.
Great video! At the next level up, it's not "positively" or "negatively charged". The alternating voltage applied results (with a lag) in a stator current and an alternating magnetic field in the stator. The changing magnetic field induces a corresponding field in the rotor. Which is more complex, and why they are talking about charge. 😉
Well done mate got a proper outlook on how a pwm code in an IGBT just cheats it’s way into mimicking the sine wave through continuous but yet discreet shots of durations altering frequency and voltage.. will join training duly..
What sort of (in)inefficiency is caused by the VFD itself? Those converter/inverter/switching processes all consume power and all introduce power losses. I'm guessing it's all about right-sizing the device for the application (and the budget) to maximize real savings.
Not really Considering it's all based on voltage, voltage not used is money saved. You cant dissipate voltage without a use. However, incorrect amperage use will use excessive voltage and burn out motor coils. But breakers and fuses regulate this.
THANKS FOR VFD EXPLANATION. WHAT I WOULD LIKE TO KNOW TT WHEN FREQEENCY CHANGES CURRENT THROUGH MOTOR ALSO CHANGES. WHEN FREQ, IS LOW LX IS LOW ALSO BACK EMF IS ALSO LOW THUS INCREASE IN CURRENT & MAY BURN THE MOTOR. HOW VFD DEALS WITH IT?
From what I understand, as the frequency is reduced, the Xl is also reduced (Xl=2¶fL). This would cause too much current to flow on the windings. So, the drive reduces the output voltage to reduce that excessive current. As the frequency is increased, Xl also increases, which would reduce current flow on the windings. To maintain current flow, and therefore torque, the drive increases the output voltage to account for the increased Xl. This way the drive can provide full torque from low speeds to full rated speed.
How can we lower the frequency to 20hz and everything is normal just slow, and sometimes when the frequency hit 48 47hz a huge problem appears putting the machine in danger ?
Well here is the market that will need this... Household Generator gives e.g. 57Hz where the Inverter needs grid input of 50Hz. So the Inverter rejects the input from the Generator. A Unit that can convert Household Generator output to ~50Hz (or what the Inverter in other areas of the world require) will have a good market size if it is not too expensive.
Thank you for this video.I have one dots regarding VFD, if VFD designs for power frequency 50HZ ,so can vfd 50hz runs motor 60hz? if not give me solutions basic on your experience>thanks again
How do you check the output of the VFD with a basic meter? On a 480v AC motor , although it’s AC I’m assuming you can’t measure AC with a multimeter since it’s pwm. Do you measure amps per leg or scope?
Good explanation of the inner workings of a VFD. However, to say that the VFD outputs AC voltage would be technically incorrect. It is a square wave. I know I am being nit picky.
Could I adjust speed twice on each revolution? lets say from 0degress to 90 degrees one speed then other speed the rest of the revolution ? can a signal be inputed to the frequency drive so it changes the speed at a certain degrees?
hi ,i am a student in electromecanics and i have to write about the different types of VFDs for asynchronous motors,i cant find any info and i am desperate .
Quick question, is it possible to use an oversized motor lets say 25hp instead of a 20hp, and run it at a lower duty cycle (example 80%) and save energy over having a 20hp motor running at 100%? I'm sure that still 20hp weather on a bigger or smaller motor is still 20hp, but I'm wondering if the the fact that the bigger motor can produce more torque with the same impulse (based on build) can maybe make it more efficient
IF WE HAVE ONE THREE PHASE MOTOR WITH 6 LEADS OUT WHICH CONNECTION WE ARE GOING TO MAKE STAR OR DELTA BEFORE WE CONNECT TO THREE IN COMMING LINE FROM VDF?? OR VDF SYSTEM USE DIFFERENT TYPE OF ELECTRICAL MOTOR??
Why use 3 phase as an example when AC is the same thing even on a single phase? What to do when we are dealing with DC mains power supply? A rectifier is not needed anymore then?
3Phase provides smoother mechanical rotation with possibly less power loss. A single phase motor requires a split phase input, A single phase alone won't rotate a squirrel cage rotor. Look it up on the web, the explanations are all there for you to read and understand.Single phase ac motors use a different rotor construction. To obtain the induced dual phase effect in the rotor, a anomaly is created in the construction of the rotor cage. This changes the induced field shape. Again read it up on the web.You can't run an ac motor off a dc supply, you need to convert back to ac or use a dc motor.
Great explanation! I have a question, why would you vary the voltage to the motor on a VFD application? I am trying to understand a motor that works with a voltage of 33-110v and frequency of 60hz to 180 hz. Why would you vary the voltage?
chadule2 I believe that'd change the speed. Whereas changing the voltage of your (probable treadmill) motor's voltage would change its power capability (torque). If this is right, it'll have helped, and if it's wrong ALL of the TH-cam experts will redirect... good luck. There are some good tutorials about controlling the speed if you look up different tools, like 2x72, drill press, lathe, and even mills.
Awesome and easy to understand. I'm a mechanical engineer that deals with lots of electronics but don't have a solid understanding of the magic pixies that make up electronics. You provide an education in a way I can understand. Thank you. Wish more professors would teach like this. Reading and understanding books is a awful and slow challenge for me because of dyslexia that was never seen in elementary school (they didn't look for things like that in the 1970's). Videos help many such as myself that learn visually.
Bionic reading try out
The narrator explained VFD basics very clearly.
Holy crap!!! The internet can be a important source of learning! This is VERY VERY USEFUL. Thanks for sharing!
Thank you for this video! I've heard so many people talking about VFDs at work. I thought it would be a much more difficult concept to learn before seeing this video. It was so easy to understand! The real world example (changing frequency to a ceiling fan) helped me understand exactly what was going on! Excellent video!
Great, good deal bro. VFDs have a plethora of settings a have some with over 120, but this is a very basic intro. Besides they have a lot of internal components that might get damaged if calibrated incorrectly.
It is a bit more complicated than what he explained
@@oscar27ization is it? What are some other things I should learn about VFD: terms and definitions I know to begin my deep-dive search?
Probably one of the most clearest and simply put explanations on VFD...Great job guys!
Learned about this technology when i started working for the rail road. AC propulsion was replacing DC traction power. But you guys teach it better!
As a RAC engineer I give u 5 stars for very useful information in this video.
⭐⭐⭐⭐⭐
this is probably the best technical video I've ever set my eyes on, the communicator explains VFD with passion like his life depends on it woow Bravo.
The best VFD training I have seen thusfar! Thank you!
Now there's a proper video for technically challenged people like me!!! Great work....thanks a lot
this really shines a light on to why manufactures prefer to size a motor a bit larger. if my blower motor is rated @1 inwc they often times say for reliability reasons it should be less the .7 inwc even tho its rated at 1 inwc. building on this, heat is what kills a motor and my amp draw is significantly lower at .7 I have a lot less heat and in relative terms more airflow for the given amount of heat.
super cool thanks for the video. I already knew how a VFD worked but i'm happy i watched it anyways because this is key information.
What a great explanation of how a VFD functions!
we need these kind of channels on youtube
Motors are dumb!!! Hahaha 🤣 cool video!!! I’m an experienced electrician but I always watch this video, it makes me laugh and it’s always good to go back to the basics once in a while.
The best tutorial on VFD. \m/
Agreed, I came to understand the DC-AC inversion and at 8:00 he makes it a lot more understandable..
Yet I don't get why the motor sees that conversion as a sinwave equivalent(and because it is dumb is not enough to account for it)
1 thing he didnt really explain is that was the on/off square wave VOLTAGE pulses to motor. Simply when you have a resistance (motor windings) and you apply voltage to a resistance, you get a current drawn by the load (motor). Because the voltage on/off pulses are so quick (microseconds, not even milliseconds), the motor cant tell that the voltage is going on and off so quick and continues to draw a near sinusoidal CURRENT and therefore rotate. As voltage stays on for more and more time, the current drawn reaches its peak, then voltage on/off time (mark/space) is reduced again, the current drawn starts to drop to zero, then the negative bus voltage is switched on to draw the negative current. The sinusoidal 'sinewave' shown over the square wave in video was the CURRENT drawn by the motor. Reducing the voltage on/off times reduces current frequency, which is directly related to motor speed, eg; 10Hz - 60Hz current draw.
+Ernesto Sastre, it seems like the it's no longer a sine wave anymore. It's like a digital signal or binary code ( varying intensity within the - or the +) so this trick kind of fools the motor into start spinning. perhaps if I attached mi oscilloscope I'd be able to see a squarish sine signal (well sort of) genius. Hit replay and see if I make sense.
+lastnameavailableok One 60 Hertz means that the current changed 60 times in one second + to -, back and forth. One Hertz is 1/60th of second. If the VFD was capable of handling kHz or MHz then, yes it would be thousandths or millionths of a second.
@@lastnameavailableok GOOD EXPLANATION!
Holyshit!!!! I actually learned something from the Internet...why isn't school this easy.
jasper fatty complication is simplicity misunderstood.
Because schools are business in a way they can careless if you learn or not they just look the money & then of course politics
@@marcematt2214 I don't think what you said is necessarily true.
The people behind these videos are professionals on this field, of course they would teach and explain better in particular topics of their field.
Schools don't have to compete for your attention by focusing on what is best for you. They're in the business of making legislators/funding sources happy.
Super tutorial! I am contemplating replacing a single phase motor on my drill press with a 3 phase motor and a VFD. I think I have a better understanding of torque vs. speed now. Thanks.
Very detailed. Thankyou...
Do you video sir how to troubleshoot overheating vfd
Excellent explaination thank you very much,
Thanks a lot for this video. Definitely appreciate you going all the way from how a motor that would benefit from a VFD works and how, internally, the VFD works, to the applications of the device itself. Much appreciated.
Great video. Disco Tesla was just what I needed this morning.
This explains why the control boxes for the huge ventilation fan motors at my Counties welding shop are soo big, I thought the control boxes for the fan were just for starting and shutting off the motors, then the instructor said the control boxes were for how much air is being sucked out and it senses what the air pressure in the room is, they're huge 3 phase motors maybe 20 or so HP, so how can you control the speed of huge 3p motors, with huge VFD boxes
Absolutely best presentation to understand the differences in single and three phase oin the motor. Great job guys thank you.
Excellent 101 training, so clear and easy to fathom
Excellent! Highly explanatory and one of the best I have seen
Very good video, however, don't forget a VFD is the most expensive way to save energy dollars on motors for a facility or home, in the end, we are talking about reducing demand charges which is the reduction in the electric bill. Reducing electric charges can be done in a number of ways 1 - Schedule the time when large motors will run, generally moving those operations to later periods say, late after to evening, 2 - hard start kits, which are a large capacitor place at the motor being started reducing in-rush draw and reducing demand on the electrical system, 3 - VFDs, however, make sure all motors with VFD's are inverter-duty or change the standard motors to ECM type which will have a cost saving also.
Great video!
At the next level up, it's not "positively" or "negatively charged". The alternating voltage applied results (with a lag) in a stator current and an alternating magnetic field in the stator. The changing magnetic field induces a corresponding field in the rotor.
Which is more complex, and why they are talking about charge. 😉
I was trying to see if anyone was going to point this out. Glad to know some people still know what they're talking about!
Nice video. We use a VFD for our ice rink. It's the coolest thing ever.
One of the best informational videos I have seen in a long time and clearly described. Wow!!
Well done mate got a proper outlook on how a pwm code in an IGBT just cheats it’s way into mimicking the sine wave through continuous but yet discreet shots of durations altering frequency and voltage.. will join training duly..
Best explanation I found on the internet after hours of searching! Thank you very much!
This is a best video ever that make me more understandable about VSD. Thanks
Great Refresher Course! Kudos on the Humor.
Can we use comparison formula to convert that motor's speed by the frequency?
Excellent! VFDs are widely used in the oil and gas industry!
this video explains very well how brushless DC motors work. in terms of the mosfets right?
11:24 is this referring to the motor's service factor or is that different?
It is possible for one vfd to control multiple three phase ac motor on cooling tower fan?
What sort of (in)inefficiency is caused by the VFD itself? Those converter/inverter/switching processes all consume power and all introduce power losses. I'm guessing it's all about right-sizing the device for the application (and the budget) to maximize real savings.
Not really
Considering it's all based on voltage, voltage not used is money saved. You cant dissipate voltage without a use. However, incorrect amperage use will use excessive voltage and burn out motor coils. But breakers and fuses regulate this.
So the VFD output frequency determines the speed and the voltage the torque?
Very good explanation Sir excellent video👌
Excellent and very comprehensive tutorial.
Nice video about function of a VFD
Can Variable Frequency Drives increase the speed above the 60Hz maximum input line frequency?
Thank you for showing the reason why VFD save $$$ and very clearly!
Hi, I like your lecture. Thanks
THANKS FOR VFD EXPLANATION. WHAT I WOULD LIKE TO KNOW TT WHEN FREQEENCY CHANGES CURRENT THROUGH MOTOR ALSO CHANGES. WHEN FREQ, IS LOW LX IS LOW ALSO BACK EMF IS ALSO LOW THUS INCREASE IN CURRENT & MAY BURN THE MOTOR. HOW VFD DEALS WITH IT?
From what I understand, as the frequency is reduced, the Xl is also reduced (Xl=2¶fL). This would cause too much current to flow on the windings. So, the drive reduces the output voltage to reduce that excessive current. As the frequency is increased, Xl also increases, which would reduce current flow on the windings. To maintain current flow, and therefore torque, the drive increases the output voltage to account for the increased Xl. This way the drive can provide full torque from low speeds to full rated speed.
this is the best video about 3 phase... hands down
dear, sir, it is an invaluable lecture and go-ahead to share with us, thanks a lot.
How can we lower the frequency to 20hz and everything is normal just slow, and sometimes when the frequency hit 48 47hz a huge problem appears putting the machine in danger ?
Have anyone noticed the misspell of " TELSA"? Great explanations by the way. Thanks
Does the torque capability increase when the speed is less? And vice versa when the speed is increased? Does the speed-torque curve match a servo?
Great video very informative
can a 12v battery power a 3 phase 5hp 250-460volts 60 hertz 15.6 amps
tefc motor using the VFD?
This tutorial is unbeatable and unprecedented. Thanks.
Oh@ my God you're great I'll watch your video again & again thank you! Sir
Best explanation of a VFD EVER. Thanks.
@ 7:35, what gives IGBTs the ability to flip the DC's polarity ??
awesome video. Super easy to understand
Brilliant Video. What a gentle introduction to VFD 🫡🫡
You killed me with the Tesla impression........LOL!!!
how do we select the value of the capacitor in between the rectifier and inverter circuit???
Well here is the market that will need this...
Household Generator gives e.g. 57Hz where the Inverter needs grid input of 50Hz. So the Inverter rejects the input from the Generator.
A Unit that can convert Household Generator output to ~50Hz (or what the Inverter in other areas of the world require) will have a good market size if it is not too expensive.
how we scale the analog signal from 0-3.7 bar to 0- 10v in single phase eaTON VFD
Thank you for this video.I have one dots regarding VFD, if VFD designs for power frequency 50HZ ,so can vfd 50hz runs motor 60hz? if not give me solutions basic on your experience>thanks again
I have a question regarding your fan example. What if we had a regulator to control the speed of the fan?
Yea I learned and got clarity on PWM process. Makes me want to build my own VFD.
I expect trains in application... but you used fan instead
Yep brilliant video, I've watched heaps that were nowhere close to this. Well done
How do you check the output of the VFD with a basic meter? On a 480v AC motor , although it’s AC I’m assuming you can’t measure AC with a multimeter since it’s pwm.
Do you measure amps per leg or scope?
beautiful video
Great video great explanation .. thumbs up :)
Good explanation of the inner workings of a VFD. However, to say that the VFD outputs AC voltage would be technically incorrect. It is a square wave. I know I am being nit picky.
Never thought I'd see Tesla's image combined with a disco mirrored ball :-)
This video is pretty cheeky, particularly for so large a company. That's an observation, not a complaint.
Could I adjust speed twice on each revolution? lets say from 0degress to 90 degrees one speed then other speed the rest of the revolution ? can a signal be inputed to the frequency drive so it changes the speed at a certain degrees?
Moter ko star m vfd s chla sakte hai kya
Great introductory video
Pretty good little video. Nice work.
Very good understanding and explation of VFDs
SIMPLY AWESOME!! It all makes sense to me now.
hi ,i am a student in electromecanics and i have to write about the different types of VFDs for asynchronous motors,i cant find any info and i am desperate .
Quick question, is it possible to use an oversized motor lets say 25hp instead of a 20hp, and run it at a lower duty cycle (example 80%) and save energy over having a 20hp motor running at 100%?
I'm sure that still 20hp weather on a bigger or smaller motor is still 20hp, but I'm wondering if the the fact that the bigger motor can produce more torque with the same impulse (based on build) can maybe make it more efficient
Hi, may I ask what is the relationship between power and speed for a constant torque drive?
IF WE HAVE ONE THREE PHASE MOTOR WITH 6 LEADS OUT WHICH CONNECTION WE ARE GOING TO MAKE STAR OR DELTA BEFORE WE CONNECT TO THREE IN COMMING LINE FROM VDF?? OR VDF SYSTEM USE DIFFERENT TYPE OF ELECTRICAL MOTOR??
2017 Revit MEP Electrical......loving it!! Great video Eaton/Westinghouse :-)
Why use 3 phase as an example when AC is the same thing even on a single phase?
What to do when we are dealing with DC mains power supply? A rectifier is not needed anymore then?
3Phase provides smoother mechanical rotation with possibly less power loss. A single phase motor requires a split phase input, A single phase alone won't rotate a squirrel cage rotor. Look it up on the web, the explanations are all there for you to read and understand.Single phase ac motors use a different rotor construction. To obtain the induced dual phase effect in the rotor, a anomaly is created in the construction of the rotor cage. This changes the induced field shape. Again read it up on the web.You can't run an ac motor off a dc supply, you need to convert back to ac or use a dc motor.
How big of a current can igbt take?
Thanks for the interesting video and what is the the PLC?
Programmable logic controller...maybe..possble
Exceptional videos, thank you
Great explanation! I have a question, why would you vary the voltage to the motor on a VFD application? I am trying to understand a motor that works with a voltage of 33-110v and frequency of 60hz to 180 hz. Why would you vary the voltage?
chadule2 I believe that'd change the speed. Whereas changing the voltage of your (probable treadmill) motor's voltage would change its power capability (torque). If this is right, it'll have helped, and if it's wrong ALL of the TH-cam experts will redirect... good luck. There are some good tutorials about controlling the speed if you look up different tools, like 2x72, drill press, lathe, and even mills.
Althoug i m not new to this stuff this is a absolutly great explanation video
very good, you dont offer online course on drives , intallation, wirring, programming and commissioning also with softstarters
this was a Very Finely Detailed video.
Very good and easy to follow.
Isn't it ill advised to drop below 20 htz for fan cooled motors?
Kindly check the spelling of 'Tesla' in the video. It is misspelled right below his image
Great explanation of everything!
Thanks...keep them coming...
Please note! @2:22, (Nicola) Telsa? Or, it is Tesla? Please review spelling in picture!